KR100378041B1 - Non-contact type battery charging control circuit by using infrared diode - Google Patents

Abstract

The present invention relates to a non-contact battery charge control circuit using an infrared diode. A battery charging circuit comprising: a charger control unit (10) which is a circuit for charge driving; A charger controller 20 connected to the charger controller 10 to provide an output voltage to the charger; And a charger and a charger case between the charger control unit 10 and the charger control unit 20. Therefore, in order to reduce the contact point even when charging the battery in a non-contact manner without an electrical contact point or in a contact-type device, such as a cordless phone or a mobile phone, the battery such as voltage, current, temperature, pressure of the battery without contact The charging control of the battery may be performed by transmitting information necessary for the charging control to the charger side.

Description

Non-contact type battery charging control circuit by using infrared diode}

The present invention relates to a battery charge control circuit, in particular, in order to reduce the contact point even in the case of non-contact charging of the battery without an electrical contact point, or in the case of charging the battery in a device containing a battery such as a cordless phone or a mobile phone The present invention relates to a non-contact battery charge control circuit using an infrared diode which is used to control the charge of a battery by transferring information necessary for battery charge control such as voltage, current, temperature, and pressure of the battery to the charger side in a non-contact manner.

Generally, the charger converts the AC power into a rated voltage of the battery and supplies the battery to the charging power of the rechargeable battery, and controls the supply of the charging power according to the state of charge of the battery. Accordingly, the charger includes a converter for converting AC power to DC power, and is configured for charging characteristics according to the type of battery.

The general charging method is to maintain a constant current until the output voltage reaches a constant value, and then to fix the voltage and vary the current when the output voltage reaches a constant value.

1 is a configuration diagram of a conventional battery charging circuit, and shows a configuration of a charger circuit for performing the above charging method. Looking at the operation of the charging method with reference to Figure 1, the power source (volage source) 111 is a source for generating AC power. The voltage converter 112 performs a function of converting the AC power to the level of the charging power. The rectifier filter 113 rectifies and smoothes the power output from the voltage converter 112 to supply the charging power of the battery 100. The voltage converter 112 and the rectifier 113 may be an AC-DC converter for converting AC power into DC power of the charging power level of the battery 100. The battery state detector 114 detects the state of the battery in the rectifier 113 and generates a control signal when the set value is exceeded. The insulator 115 electrically insulates the power source 111 from the battery 100 and transmits a signal of the battery state detector 114 to the controller 116. The insulating part 115 may be configured as a photo coupler. The controller 116 includes a switch connected between the power source 111 and the voltage converter 112, and controls the supply of AC power to the voltage converter 112 according to the output of the insulation unit 115.

Normally, a normal battery charger is a contact charger, which connects the output terminals of the charger to three to four terminals of the battery pack, transfers energy to the battery through the contact of the conductor, and provides information necessary for battery control. Receive.

Such contact chargers are frequently researched for contactless chargers that transmit energy in a non-contact manner in order to solve such problems due to poor contact.

In addition, the contactless charger has a primary and a secondary side of a separate transformer (a transformer in which the primary side and the secondary side are spatially separated for the energy transfer of the non-contact charger) are placed inside the charger and the charger, respectively. Energy is transferred, and a case of a charger and a charger is present between the primary and secondary sides of the split transformer. In this case, since the battery is present on the side of the charger, there is a problem in that information necessary for battery charge control such as voltage, current, temperature, and pressure of the battery cannot be directly used by the charger side.

The present invention has been proposed to solve the above problems of the prior art, an object of the present invention is to perform a contactless information transfer to transfer the information necessary for the battery charge control from the charger side to the charger side, and also in a contact manner If you want to reduce the number of contact terminals between the charger and the battery pack even when charging the battery, the contactless battery without electrical contact points in the device that contains the battery, such as a cordless phone or a mobile phone, to perform battery charging control through contactless information transfer. Can be used to control the charging of the battery by transmitting information necessary for battery charging control such as voltage, current, temperature, and pressure of the battery to the charger side in order to reduce the contact point even when charging the battery or by contacting the battery. Contactless with infrared diode It is to provide a battery charge control circuit.

1 is a block diagram of a conventional battery charging circuit.

2 is a non-contact battery charge control circuit using an infrared diode according to the present invention.

Explanation of symbols on the main parts of the drawings

10: charger control unit 20: charger control unit

11 diode OR circuit 12 comparator

D1, D2: Diodes R1-R5: Resistance

D3: infrared diode Q1: infrared diode driving transistor

C: Capacitor Q2: Infrared Sensing Transistor

In order to achieve the above object, the present invention provides a battery charging circuit comprising: inputting a battery voltage, a battery current, converting a current into a voltage, and then applying a constant gain to the comparator via a first diode and a second diode, A charger control unit 10 which controls the infrared diode driving transistor to be turned on to emit infrared light when the battery is high compared to the set reference voltage so as to be charged; A charger controller 20 controlling an amount of energy delivered to the charger and the battery by adjusting an output voltage according to the infrared emission signal output from the charger; And it provides a non-contact battery charging control circuit using an infrared diode, characterized in that consisting of a case existing between the charger control unit and the charger control unit.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Referring to FIG. 2, the non-contact battery charge control circuit using the infrared diode according to the present invention includes a charger control unit 10 and a charger control unit 20.

The charger controller 20 includes an infrared sensing transistor Q2, an integrator 21, and a fourth resistor R4. The charger control unit 10 includes a diode OR circuit 11, a comparator 12, and a first resistor. And a second resistor R2, a third resistor R3, an infrared diode D3, and an infrared diode driving transistor Q1. A charger and a charger case exist between the charger control unit 20 and the charger control unit 10.

The diode OR circuit 11 receives a battery voltage and a battery current, converts the current into a voltage, and applies appropriate gains Ki and Kv through a current-voltage conversion amplifier Ki and a voltage amplifier Kv that apply a constant gain. After that, the two diodes D1 and D2 are output to have the higher value among the two values, and the positive terminal of the comparator 12 is input. The diode OR circuit 11 automatically switches the constant current and constant voltage functions necessary for charging the battery.

The comparator 12 receives the output of the diode OR circuit 11 as a (+) terminal input and compares it with a preset reference voltage to output a high or a low.

When the output of the comparator 12 is high, the infrared diode driving transistor Q1 is turned on and the infrared diode D3 is turned on to emit infrared rays. When the output of the comparator 12 is low, infrared rays are not emitted.

When the infrared diode D3 is turned on and the infrared rays are emitted, the infrared sensing transistor Q2 of the charger control unit 20 is turned on so that the collector terminal voltage Vr has a low value. ) The voltage Vr of the collector terminal has a high value.

That is, according to whether the infrared diode D3 emits light, the voltage Vr of the collector terminal Q2 of the infrared sensing transistor has a high value or a low value. When the infrared diode D3 is turned on and the infrared rays are emitted, the infrared sensing transistor Q2 is turned on so that the collector terminal voltage Vr has a low value. When the infrared diode D3 is turned off, the infrared rays are not emitted. The sensing transistor Q2 is turned off and the collector terminal voltage has a high value.

The reference voltage inside the integrator 21 has an intermediate value between the high and low values of Vr. When Vr is high, the integrator 21 lowers the output voltage Vc by a predetermined time constant. When Vr is low, the integrator 21 increases the output voltage Vc by a predetermined time constant.

The charger may adjust the duty, frequency, and phase according to the integrator output voltage Vc to control the amount of energy delivered to the charger and the battery to perform proper charging according to the condition of the battery.

Therefore, in order to reduce the contact point even in the case of non-contact charging of the battery without an electrical contact point to a device having a built-in battery, such as a cordless phone or a mobile phone, in order to reduce the contact point, the battery voltage, current, temperature, pressure For example, it is possible to control the charging of the battery by transmitting information necessary for the battery charging control to the charger side.

As described above, the non-contact battery charge control circuit using the infrared diode according to the present invention has no contact terminal for battery charge control when charging the battery in a non-contact manner, and transmits information necessary for the battery charge control in a non-contact manner to perform battery charge control. In order to reduce the number of contact terminals between the charger and the battery when the battery is charged in a contact manner, the battery charge may be controlled by transferring information necessary for the battery charge control in a non-contact manner.

In addition, in order to reduce the contact point even when charging the battery in a non-contact without the electrical contact point to the device with a built-in battery, such as a cordless phone or mobile phone, the voltage, current, temperature, pressure of the battery without contact For example, there is an effect of controlling the charging of the battery by transferring information necessary for the battery charging control to the charger side.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art will be able to variously modify and change the present invention without departing from the spirit and scope of the invention as set forth in the claims below. It will be appreciated.

Claims (4)

In the battery charging circuit: When the battery voltage and battery current are input, the current is converted into a voltage, and then a constant gain is applied to the comparator through the first diode and the second diode, and when the voltage is high compared to the preset reference voltage, A charger control unit 10 controlling the infrared diode driving transistor to be turned on to emit infrared rays; A charger controller 20 controlling an amount of energy delivered to the charger and the battery by adjusting an output voltage according to the infrared emission signal output from the charger; And Non-contact battery charging control circuit using an infrared diode, characterized in that consisting of a case existing between the charger control unit and the charger control unit. The method of claim 1, The charger control unit 10 is After inputting battery voltage and battery current and applying proper gain (Ki, Kv), it outputs the higher of two values through two diodes (D1, D2), and automatically switches the constant current and constant voltage functions required for charging the battery. Diode OR circuit 11; A comparator 12 which receives the output of the diode OR circuit 11 as a (+) terminal and outputs a high or low by comparing the first reference voltage with a preset first reference voltage; A second resistor R2 having one side connected to the output terminal of the comparator 12; A third resistor R3 to which one first constant voltage Vcc1 is applied; (+) Terminal is connected to the other side of the third resistor (R3), the output of the comparator 12 is high (high) when the diode is turned on (ON) the infrared sensing transistor of the charger 20 ( An infrared diode (D3) which emits infrared rays to Q2) and does not emit infrared rays when the output of the comparator 12 is low; And The emitter is connected to ground, the base is connected to the other side of the second resistor R2, and the collector is composed of an infrared diode driving transistor Q1 connected to the negative terminal of the infrared diode D3. Non-contact battery charge control circuit using diodes. The method of claim 2, The diode OR circuit 11 is A current-voltage conversion amplifier Ki that receives the battery current and provides a voltage amplified by Ki; A voltage amplifier (Kv) receiving the battery voltage and providing a voltage amplified by Kv; A first diode (D1) connected to an output of the current-voltage conversion amplifier (Ki) at a (+) terminal, and a (-) terminal connected to a (+) terminal of the comparator 12; A second diode (D2) connected to an output of the voltage amplifier (Kv) at a (+) terminal, and a (-) terminal connected to a (-) terminal of the first diode (D1); And Non-contact battery charging control circuit using an infrared diode, one side is connected to the (-) terminal of the second diode (D2) and the other side is composed of a grounded first resistor (R1). The method of claim 1, The charger control unit 20 A fourth resistor R4 to which a second constant voltage Vcc2 is applied; When the infrared diode D3 of the charger 10 is turned on and the infrared light is emitted, the transistor is turned on so that the collector terminal voltage Vr has a low value, and when the infrared light is not emitted, the transistor is turned off and Vr has a high value. An infrared sensing transistor Q2; And RC integrator consisting of capacitor (C), fifth resistor (R5), and OP-AMP. The second reference voltage has a middle value between the high and low values of Vr, and is output by a fixed time constant when the internal Vr is high. The voltage Vc is lowered. If Vr is low, the output voltage Vc is increased by a fixed time constant, and the charger adjusts the duty, frequency, and phase according to the output voltage Vc of the RC integrator to transfer the amount of energy transferred to the charger and the battery. Non-contact battery charge control circuit using an infrared diode, characterized in that it is composed of an integrator (21) to control to enable proper charging according to the state of the battery.